COMEDK · Chemistry · 9. Redox Reactions
The concentration and percentage purity of Oxalic acid can be determined by titration with \(\mathrm{KMnO}_4\) in presence of dil. \(\mathrm{H}_2 \mathrm{SO}_4\). Instead of dil. \(\mathrm{H}_2 \mathrm{SO}_4\), dil HCl cannot be used because
- A HCl can also oxidise Oxalic acid to \(\mathrm{CO}_2\) and \(\mathrm{H}_2 \mathrm{O}\).
- B Oxalic acid oxidises HCl to \(\mathrm{Cl}_2\).
- C HCl can also reduce \(\mathrm{MnO}_4^{-}\)to \(\mathrm{Mn}^{2+}\)
- D HCl can also provide \(\mathrm{H}^{+}\)ions in addition to \(\mathrm{H}^{+}\)ions from Oxalic acid.
Answer & Solution
Correct Answer
(C) HCl can also reduce \(\mathrm{MnO}_4^{-}\)to \(\mathrm{Mn}^{2+}\)
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